Due to the closure of the developer's topic for the Xiaomi Wifi Router 3G (Xiaomi WiFi Router 3G) I'm creating this new one so we can talk about the recent release of OpenWRT 18.06 and it's future service releases and how it's perfoming on the Xiaomi 3G.

Hi, I got my Mi 3G Router yesterday and so I wanted to flash OpenWRT on it. I did everything that was written in the manual. So flashed also SSH Rom and after that installed all the commands. But after I entered "reboot" and the router rebooted, I probably did not watited enougt , I think only 2-4 Minutes when the blue LED came. So I could not connect with lan on 192.168.1.1 and also not on 192.168.31.1. I forgot to try on SSH . So in my panic I pressed the reset button. Also did a 30-30-30 rese…

Everything goes sweet, till I changed the LAN IP from 192.168.1.1 to 192.168.0.1
now I lost every possible connection to the OpenWrt system.
I tried both IP, using webUI and SSH, but none of them works.

What is on your kernel0 partition?
If that is you stock kernel then:
stock firmware renamed to miwifi.bin on fat32 formatted usb stick
execute fw_setenv flag_try_sys2_failed 1 from ssh/serial console
plug usb stick
reboot
The board will reboot into system 1 (stock basic kernel) and wait with system red light slowly blinking for a FAT formatted usb stick with a recovery image to be inserted. Press and hold the reset button for around 1 second. Status LED will turn yellow during recovery and …

or disable the USB3 driver to force fallback to USB2.0. Many current LEDE devices aren't even noticably faster on USB3.0 data transfers compared to 2.0.

Could someone point me how to disable USB3 driver? It seems that USB 3.0 is compiled into the kernel. Removing of kmod-usb3 package does not help. The same with rmmod xhci-hcd.

So, I see a ton of complaints that 2.4 WiFi does not work in pair with OpenWrt if you have connected USB device. Of course, I have external USB card-reader + microSD card.

The same configuration works excellent with stock firmware. But! There is the one significant NOTE! Xiaomi DISABLES USB 3.0 by default in their stock firmware. They even write in GUI that enabling USB 3.0 will gift you a ton of problems for 2.4Gz.

I just flashed 18.06.1.
Again.
After initiated the password, I exited LuCi without any configuration change, and power off (I mean plug off the power supply) and on, to see what happens.
Bingo, LuCi is dead.
The good news is SSH still alive.
It looks like OpenWrt is not available for Xiaomi router 3g, not yet.